Apparatus for making cushion tires



E. NELSON ET AL APPARATUS FOR MAKING CUSHION TIRES July 14, 1931.

Filed April 18, 1930 ATTQRN EY llval Patented July 14, 1931 umrso TA S nnwrmniennson Ann GEORGE NELSON-,5 or BELLEvILnmNEwqnnsnmnssreivons 'ro ovnmum cusmonmmn co PANY, 1nd,; OENEW YORK, N. A. GORPORATION or mew your:

1 Application filed A ril 1 8,

In "co-pending application Serial No; 194',-

362, filed May 26, 1927, by Albert L; Schoflf .and us as joint inventorsthere is described arr apparatus for making "cushroni tlres,

which" includes a sectional core having '1 lflangesiwhichlie under the led es of an undercut groove in a tirebas'e; his sectional coreis expanded circumferentially by a wedge to force the flanges ofthe core-sectrons outward against theflledges of the base Lgroove to-pIac e the corein positionfor the "molding of the tire against it. After the molding, the core is aflowed to .contr'actclrcmnferentially permitting its sections to drop downin th-e groove in thebasersothat they are free from the res-see which has been molded about them and may bemoved along the roove in the haseto a slot through "wfiic they vare withdrawn] f In a specific apparatus shown in that aplic'atio-n', the wedge for causing" the circumerefntial expansion. of the core was forced into thecore fby meansof a screw threaded intoa ring underlying the base of the core and forming part'of aspeci al tire mold. 1'11 accordance with the present invention, we have improved thei'core-e2 pending apparatus by; forming it "so that 'itl-niay' be located wholly outsid'e the, inner circumferential sur face of the tireh'ase; "permits the expansion of the corebefo're' any part ofthe firemen is applied to thebase' band of the strengtheningthe haseof. the tire as herein 1 after described; The exact nature of the tire and, therefore, permits placing the -exg I 7 directly over the .slot 12 in the base-band are provided withii-nclined end surfaces 26 'panded core and the base-band an ordinary tire mold; The invention involvesfla further improvement in the direction .of

invention mayibest be understood from a de- "tailed description oi the specific embodiment of it which is shown in the accompanying drawings, in which a i Fig. 1 is a sideview of a base band and co-reenibodying the invention, the ba'se-hand 25s an enlarged; partial, median secbeing sectioned en its median plane;

3 urarmmus ron- MAKING cusmoi: Tums 1930. Serial 116445347;

tion of the Base-hand and-core; showing the slot in the 'haseehand, and the wedge" about v to be inserted in the core to expand it circumferentially; i

' Fig. 3 's' an enlarged transverse section on-the line ?3' of Fig; 1'; and

' :Fig. 4 isan' enlarged transverse section on the line of 'Fig, 1 showing, addition to the parts shown in: Fig. 1, a tire body 'mol'd-ed again-stthe core and base-band.

y The base-band 10 is of the type commonly used for vulcanizedonsolid tires; difli'e ring from such base-band's only in that it contains in its outer" periphery a centrally l cated, undercut circumferential groove 11 and'a slot I2 extending'from a portionof the bottom of said groove through to the inner surface of the base-band. V g arcuate sectors 21 ;hav1ng thelr ends abutting on radial lines.

Thel'core consists of The cross-sectionalshape of the sectors corresponds to the cross-section of the desired cavity in the tire. Each sector has at its bottom lateral flanges 22 adapted to underlie theflverhanging ledges at the sides of the undercutgroovelh The sectors 21 are loosely linked togetherby means of hooks 23 lying in grooves 24 formed in the center of each sector at its lowercorners". At the point of the core which is diametrically opposite the slot: 12,110 link is provided. The groove in the base band has a; radial depth below its overhanging ledges 13 greater than the thickness of the fianges 22 of .the core sections, so ,as'topermit a radialv inand-out movement of each core section;

Short core sections 25 which iare placed between which. a We'dge27' may be inserted to expand the core circumferentially, so as to draw the flanges 22 of the core sections i parts-sep r by Shims, so that ifs'length may he'adjflsted;

vIn so .as ourapparatus has been described, corresponds with that shown in the prior applicati'onheretofore mentioned. The improvements which We have effected over that apparatus will next be described.

The means for forcing the wedge 27 into the core to expand the core circumferentially consists of two screws 30 which may be threaded into tapped holes 31 formed in the bottomsof the short core sections 25, and a bar 32 underlying the wedge 27 and drawn towards the core by the heads of the screws 30. The bar is provided with slots 33 for the screws, so that thescrews may move away from one another during the separating movement of the short core sections caused by forcing the wedge 27 in between them. The bar 32 is so thin that, when it is drawn in to expand the core, it and the headsof the screws lie in the slot 12 and completely outside the inner peripheral surface of the base-band 10.

In order to make this possible and at the same time to give the bar 32 the necessary strength, thebottom surfaces of the wedge 27 and the short sections 25 contain a shallow V shaped groove 34: providing space for a V-shaped ridge 35 on the outer surface of the bar 32 which adds materially to its strength. V

All the sections'21 of the core contain in their bottoms a shallow V-shaped groove 36 like the groove 34. This permits forming a wide ridge 37 onthe strip of metal 14: of the base-band at the bottom of the groove 11, which adds materially to the strength of the base-band. r I

The upper surfaces of the flanges 22 of the core sectors and theunder' surfaces of the ledges 13 of the groove in the base-band are made parallel to the inclined sides of the groove 36 in the bottom surfaces of the core sections. The portions of the sides of the core sections immediately above the flanges are inclined, and the inner edges of the ledges 13 are correspondingly inclined. This results in a wedge fit between the lower ends of the core sections and the sides of the grooves when the core is expanded circumferentially, which effectively excludes rubber compoiuid from the space below the core sectors during the molding of the tire body,

without the use of the core covering described in the aforesaid applicationl The apparatus which has been described 7 is used in the manner described in the afore said application, except that no part of the tire mold need be;applied until after the core has been expanded, and the core and base-band, with the material for a tire body placed thereon, may then be placed in any ordinary type of tire mold.

What is claimed is :1

1. Apparatus for -making a hollow vulcanized-on cushion tire, comprising a metal base-band having an undercut circumferential groovein its outer periphery and a longitudinal slot registering with a part of said groove, an annular core consisting of r a bar in said slot underlying the wedge,and

ing edges thereof, said core containing a tapering. opening, a wedge insertable into said opening, and means directly engaging the sections of the core at opposite sides of said opening and adapted to force I said wedge into the core to expand it circumferentially.

3. Apparatus for making a hollow vulcanized-on cushion tlre, comprising a metal base-band havlng an undercut clrcumferential groove in its outer periphery and a Ion-:3

gitudinal slot registering with a part of said groove, an annular core consisting of arcuate core sections having lateral flanges fitting looselyin said groove under the overhanging edges thereof, said core containing a tapering opening, a wedge insertable into said opening, a bar underlying said wedge, and screws-passing through slots in the bar and entering tapped holes in the core at opposite sides of the opening therein to draw said bar in to force the wedge into the core and expand it circumferentially.

4:. Apparatus for making a hollow vulcanized-on cushion tire, comprising a metal base-band having an undercut circumferential groove in its outer periphery and a 10ngitudinal slot registering with a part of said groove, an annular core consisting of arcuate core sections having lateral flanges fitting loosely in said groove under the overhanging edges thereof, a wedge insertable into the core through the slot in the base-band means for drawing saidbartowards the in- Iler surface of the core to force the wedge into the core and expand it circumferentially. i v 5. Apparatus for making a hollow vul- .canized-on cushion tire, comprising a metal base-band having an undercut circumferen-- tial groove in its outer periphery and a longitudinal slot registering with a part of said groove, an annular core consisting of arcuate core sections having lateral flanges fitting loosely in said groove under the overhang ing edges thereof, the sides of the core sections just above said lateral flanges and the overhanging edges of the groove having correspondingly inclined surfaces, and means for expandlngthe core circumferentially to cause a wedge fit between said correspondingly inclined surfaces.

6. Apparatus for making a hollow vulcanized-on cushion tire, comprising a metal base-band having in its outer periphery an undercut circumferential groove having a strengthening ridge at its bottom, and an annular core consisting of arcuate core sections, having lateral flanges under the overhanging edges of said groove, and containing in their bottoms grooves fitting the strengthening ridge at the bottom of the groove in the base-band, so that the core sections may drop down in the groove.

In testimony whereof we have hereunto set our hands.

EDWARD NELSON. GEORGE NELSON. 

